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speex resampling instead of libsamplerate?

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This commit is contained in:
Anthony Samms
2025-11-21 16:47:05 -05:00
parent f3c77df017
commit b74b0bb0ac
2 changed files with 77 additions and 39 deletions
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86
libs/audio/audio.c
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@@ -15,7 +15,8 @@
#include <stdio.h>
#include <stdlib.h>
#include <sndfile.h>
#include <samplerate.h>
//#include <samplerate.h>
#include <speex/speex_resampler.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
@@ -78,7 +79,7 @@ typedef struct music {
// Music context data, required for music streaming
typedef struct music_ctx {
SNDFILE *snd_file;
SRC_STATE *resampler;
SpeexResamplerState *resampler;
double src_ratio;
} music_ctx;
@@ -693,28 +694,50 @@ sound load_sound_from_wave(wave wave) {
if (wave.sampleRate != AUDIO.System.sampleRate) {
TRACELOG(LOG_INFO, "Resampling wave from %d Hz to %f Hz", wave.sampleRate, AUDIO.System.sampleRate);
SRC_DATA src_data;
src_data.data_in = wave.data;
src_data.input_frames = wave.frameCount;
src_data.src_ratio = AUDIO.System.sampleRate / wave.sampleRate;
src_data.output_frames = (sf_count_t)(wave.frameCount * src_data.src_ratio);
int error = 0;
SpeexResamplerState *resampler = speex_resampler_init(
wave.channels,
wave.sampleRate,
(int)AUDIO.System.sampleRate,
SPEEX_RESAMPLER_QUALITY_DESKTOP,
&error
);
resampled_wave.data = calloc(src_data.output_frames * wave.channels, sizeof(float));
if (resampled_wave.data == NULL) {
TRACELOG(LOG_WARNING, "Failed to allocate memory for resampling");
if (error || resampler == NULL) {
TRACELOG(LOG_WARNING, "Failed to initialize resampler: %d", error);
return sound;
}
src_data.data_out = resampled_wave.data;
int error = src_simple(&src_data, SRC_SINC_BEST_QUALITY, wave.channels);
if (error) {
TRACELOG(LOG_WARNING, "Resampling failed: %s", src_strerror(error));
spx_uint32_t out_frames = (spx_uint32_t)(wave.frameCount * AUDIO.System.sampleRate / wave.sampleRate) + 10;
resampled_wave.data = calloc(out_frames * wave.channels, sizeof(float));
if (resampled_wave.data == NULL) {
TRACELOG(LOG_WARNING, "Failed to allocate memory for resampling");
speex_resampler_destroy(resampler);
return sound;
}
spx_uint32_t in_len = wave.frameCount;
spx_uint32_t out_len = out_frames;
error = speex_resampler_process_interleaved_float(
resampler,
wave.data,
&in_len,
resampled_wave.data,
&out_len
);
speex_resampler_destroy(resampler);
if (error != RESAMPLER_ERR_SUCCESS) {
TRACELOG(LOG_WARNING, "Resampling failed with error: %d", error);
FREE(resampled_wave.data);
return sound;
}
resampled_wave.frameCount = src_data.output_frames_gen;
resampled_wave.sampleRate = AUDIO.System.sampleRate;
resampled_wave.frameCount = out_len;
resampled_wave.sampleRate = (int)AUDIO.System.sampleRate;
resampled_wave.channels = wave.channels;
resampled_wave.sampleSize = wave.sampleSize;
is_resampled = true;
@@ -913,9 +936,9 @@ music load_music_stream(const char* filename) {
if (sf_info.samplerate != AUDIO.System.sampleRate) {
TRACELOG(LOG_INFO, "Resampling music from %d Hz to %f Hz", sf_info.samplerate, AUDIO.System.sampleRate);
int error;
ctx->resampler = src_new(SRC_SINC_FASTEST, sf_info.channels, &error);
ctx->resampler = speex_resampler_init(sf_info.channels, sf_info.samplerate, AUDIO.System.sampleRate, SPEEX_RESAMPLER_QUALITY_DESKTOP, &error);
if (ctx->resampler == NULL) {
TRACELOG(LOG_WARNING, "Failed to create resampler: %s", src_strerror(error));
TRACELOG(LOG_WARNING, "Failed to create resampler");
free(ctx);
sf_close(snd_file);
return music;
@@ -962,7 +985,7 @@ void unload_music_stream(music music) {
if (music.ctxData) {
music_ctx *ctx = (music_ctx *)music.ctxData;
if (ctx->snd_file) sf_close(ctx->snd_file);
if (ctx->resampler) src_delete(ctx->resampler);
if (ctx->resampler) speex_resampler_destroy(ctx->resampler);
free(ctx);
}
unload_audio_stream(music.stream);
@@ -1036,19 +1059,22 @@ void update_music_stream(music music) {
sf_count_t frames_written = 0;
if (ctx->resampler) {
SRC_DATA src_data;
src_data.data_in = input_ptr;
src_data.input_frames = frames_read;
src_data.data_out = buffer_data + subBufferOffset;
src_data.output_frames = subBufferSizeFrames;
src_data.src_ratio = ctx->src_ratio;
src_data.end_of_input = (frames_read < frames_to_read);
spx_uint32_t in_len = frames_read;
spx_uint32_t out_len = subBufferSizeFrames;
int error = src_process(ctx->resampler, &src_data);
if (error) {
TRACELOG(LOG_WARNING, "Resampling failed: %s", src_strerror(error));
int error = speex_resampler_process_interleaved_float(
ctx->resampler,
input_ptr,
&in_len,
buffer_data + subBufferOffset,
&out_len
);
if (error != RESAMPLER_ERR_SUCCESS) {
TRACELOG(LOG_WARNING, "Resampling failed with error: %d", error);
}
frames_written = src_data.output_frames_gen;
frames_written = out_len;
} else {
if (music.stream.channels == 1 && AUDIO_DEVICE_CHANNELS == 2) {
for (int j = 0; j < frames_read; j++) {